Brihat Samrat Yantra Introduction: Brihat Samrat Yantra is a huge sundial. It has a dial with an angle of 27 degrees and a height of 27 meters, which is the latitude of Jaipur. The shadow it casts moves up to 4 meters every hour and can help calculate local and meridian times, as well as measure certain numbers on celestial bodies, such as declination and altitude. It is said to be still used by astronomers today.